【Keepalived】VIP同时在主、备节点上出现的分析和排查

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已于 2024-04-10 19:46:17 修改 · 1.5k 阅读

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#负载均衡

于 2024-04-10 15:34:06 首次发布

在生产环境中，考虑到硬件负载的购买、维护成本，我们可能会在生产环境上使用 keepalived + nginx 来搭建一套两节点或者三节点的软件负载，nginx主要根据配置，为后端应用提供请求的反向代理和负载均衡的功能，而 keepalived 则主要用于检测nginx服务状态，并完成VIP在主、备节点之间的漂移。nginx在优化后能达到10万级的高并发特性，为中小型应用提供了完美的负载解决方案。

不过，在某些情况下，我们可能会遇到一个问题，就是VIP在主备节点上同时出现，这个问题一般是由于主、备节点无法正常通信，导致备节点认为主节点挂了，因此就将VIP设置给自己了。如下面所示，192.168.223.200这个VIP就在主、备节点上同时出现了。

主节点：
# systemctl status keepalived.service 
● keepalived.service - LVS and VRRP High Availability Monitor
   Loaded: loaded (/usr/lib/systemd/system/keepalived.service; enabled; vendor preset: disabled)
   Active: active (running) since 三 2024-04-10 14:49:23 CST; 22s ago
     Docs: man:keepalived(8)
           man:keepalived.conf(5)
           man:genhash(1)
           https://keepalived.org
  Process: 1080 ExecStart=/usr/local/keepalived/sbin/keepalived -f /etc/keepalived/keepalived.conf $KEEPALIVED_OPTIONS (code=exited, status=0/SUCCESS)
 Main PID: 1092 (keepalived)
    Tasks: 2
   CGroup: /system.slice/keepalived.service
           ├─1092 /usr/local/keepalived/sbin/keepalived -f /etc/keepalived/keepalived.conf -D
           └─1097 /usr/local/keepalived/sbin/keepalived -f /etc/keepalived/keepalived.conf -D

4月 10 14:49:26 vm-3rd89n7dd Keepalived_vrrp[1097]: Sending gratuitous ARP on ens33 for 192.168.223.